blow-out fracture

blow-out fracture
fracture of the orbital floor caused by a sudden increase of intraorbital pressure due to traumatic force; the orbital contents herniate into the maxillary sinus so that the inferior rectus or inferior oblique muscle may become incarcerated in the fracture site, producing diplopia on looking up. In the pure type there is disruption of the orbital floor without involvement of the orbital rim; the impure type involves the rim, i.e., there is concomitant midfacial fracture.

Coronal CT scan demonstrating an orbital blow-out fracture.


Medical dictionary. 2011.

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